Flash heat exchange device

Abstract

The utility model discloses a flash evaporation heat exchange device which comprises a high-pressure heating tank and a heat exchange device. The high-pressure heating tank is used for heating and pressurizing flash liquid and is connected with a to-be-flashed liquid input pipe; the heat exchange device is provided with a heat exchange liquid leaving cavity, a flash evaporation heat exchange cavity and a heat exchange liquid entering cavity which are sequentially connected in a sleeving mode, and the heat exchange liquid leaving cavity is arranged on the outer side of the high-pressure heating tank in a sleeving mode; the heat exchange liquid inlet cavity is connected with a to-be-heated liquid inlet pipe, the heat exchange liquid inlet cavity is communicated with the heat exchange liquid outlet cavity through a heat exchange channel, and the heat exchange liquid outlet cavity is connected with a heated liquid outlet pipe; the high-pressure heating tank is connected with the flash evaporation heat exchange cavity through a flow guide pipe; and the flash heat exchange cavity is connected with an unvaporized liquid discharge pipe. The heated heat exchange liquid can play a role in heat preservation on the high-pressure heating tank and the outer side wall of the flow guide pipe, and heat loss is reduced. The side wall of the flash heat exchange cavity can exchange heat, the heat exchange area is enlarged, and the heat exchange efficiency is improved. The side wall of the diversion pipe is not in direct contact with the outside, and heat loss is reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a flash heat exchange device. Background Technology

[0002] A flash heat exchanger is a device that combines flash evaporation and heat exchange processes. It is mainly used for efficient heat transfer or recovery and is commonly found in fields such as chemical engineering, power generation, seawater desalination, and waste heat utilization. Its core principle is to achieve heat exchange or material separation through a sudden pressure drop and rapid evaporation.

[0003] With the continuous development of the industrial sector, flash heat exchange technology has been widely applied in industries such as chemical, power, and refrigeration. However, in practical applications, ordinary flash heat exchange devices suffer from low heat exchange efficiency. Their internal structure is relatively simple, and the arrangement and design of the heat transfer tube bundles are not optimized, resulting in insufficient utilization of the heat exchange area. Furthermore, insufficient consideration is given to the gas-liquid two-phase flow characteristics during the flash process, leading to poor separation of steam and liquid, and a large amount of heat cannot be transferred in a timely and effective manner, severely affecting the overall heat exchange efficiency. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a flash heat exchange device that can improve heat exchange efficiency.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A flash heat exchanger includes:

[0007] A high-pressure heating tank is used to heat and pressurize the flash liquid; the high-pressure heating tank is connected to a liquid input pipe for flashing, which is used to connect to an external liquid input source.

[0008] A heat exchange device is provided, comprising a heat exchange liquid exit chamber, a flash heat exchange chamber, and a heat exchange liquid inlet chamber, which are sequentially nested from the inside to the outside along the radial direction of the heat exchange device. The heat exchange liquid exit chamber is located outside the high-pressure heating tank. The heat exchange liquid inlet chamber is connected to a liquid inlet pipe to be heated. The heat exchange liquid inlet chamber and the heat exchange liquid exit chamber are connected by a radially arranged heat exchange channel passing through the flash heat exchange chamber. The heat exchange liquid exit chamber is connected to a liquid discharge pipe after heating. The high-pressure heating tank is connected to the flash heat exchange chamber through a guide pipe for allowing the high-temperature, high-pressure liquid from the high-pressure heating tank to flow into the flash heat exchange chamber. The flash heat exchange chamber is connected to an unvaporized liquid discharge pipe for discharging unvaporized solvent to the external environment.

[0009] Furthermore, the flash heat exchanger also includes a steam reflux device, which includes a reflux pipe and a one-way valve. One end of the reflux pipe is connected to the top of the flash heat exchange chamber, and the other end of the reflux pipe is connected to the top of the high-pressure heating tank. The one-way valve is located on the reflux pipe and is used to allow the flashed steam to reflux back to the high-pressure heating tank.

[0010] Furthermore, the flash heat exchange chamber is equipped with a gas-liquid separation device, which can supply steam to the return pipe and retain the condensed liquid; the bottom of the gas-liquid separation device is connected to a liquefied liquid drain pipe, which is used to discharge the solvent condensed by the gas-liquid separation device to the external environment.

[0011] Furthermore, the gas-liquid separation device divides the interior of the flash heat exchange chamber into an upper chamber and a lower chamber. The gas-liquid separation device includes a sloping top plate and a side plate connected to the sloping top plate. The side plate has multiple air passage holes, which connect the upper chamber and the lower chamber.

[0012] Furthermore, the gas-liquid separation device is provided with two condensate collection tanks, which are distributed from the inside to the outside along the radial direction of the high-pressure heating tank. The condensate collection tank near the high-pressure heating tank and the condensate collection tank away from the high-pressure heating tank are connected by a conduit, and the condensate collection tank away from the high-pressure heating tank is connected to the liquefied drain pipe.

[0013] Furthermore, the heated liquid discharge pipe and the liquid input pipe to be flashed are connected sequentially along the liquid flow direction.

[0014] Furthermore, the steam reflux device is also equipped with a suction device, which is used to draw the gas in the flash heat exchange chamber into the high-pressure heating tank.

[0015] Furthermore, the end of the guide tube located inside the flash heat exchange chamber is a Venturi tube structure, which is used to depressurize the high-pressure liquid and release it into the low-pressure flash heat exchange chamber.

[0016] Furthermore, the heat exchange channel is provided with multiple channels, which are distributed at intervals along the direction of gravity; the multiple heat exchange channels are distributed at intervals along the circumference of the flash heat exchange chamber.

[0017] Furthermore, the sidewall between the high-pressure heating tank and the heat exchange liquid exit chamber is a component made of heat-insulating material.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The high-pressure heating tank, heat exchange liquid exit chamber, flash heat exchange chamber and heat exchange liquid inlet chamber are sequentially connected from the inside to the outside. The heat exchange liquid exit chamber and heat exchange liquid inlet chamber are used for insulation. The lost heat will be transferred to the heat exchange liquid. The heat exchange liquid that has been heated after leaving the heat exchange chamber can play a role in heat preservation of the outer wall of the high-pressure heating tank and the guide pipe, reducing the loss of heat to the external environment.

[0020] 2. The heat exchange liquid exit chamber and the heat exchange liquid inlet chamber are respectively fitted inside and outside the flash heat exchange chamber, so that the side wall of the flash heat exchange chamber can also exchange heat with the liquid to be exchanged, which not only expands the heat exchange area, but also improves the heat exchange efficiency.

[0021] 3. The sidewall of the guide tube for diverting the flash liquid is not in direct contact with the external environment, which further reduces heat loss during the diversion process, ensures that heat is effectively transferred to the liquid to be exchanged, and thus improves heat exchange efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the flash heat exchanger of this utility model;

[0023] Figure 2 for Figure 1 The cross-sectional view shown shows the flow path of the flash liquid, where the dashed lines represent the flow path of the flash liquid.

[0024] Figure 3 for Figure 1 The cross-sectional view shown shows the flow path of the liquid to be heated, indicated by the dashed lines.

[0025] In the diagram: 1. High-pressure heating tank; 2. Inlet pipe for flash evaporation liquid; 3. Heat exchange device; 301. Heat exchange liquid exit chamber; 302. Flash evaporation heat exchange chamber; 303. Heat exchange liquid inlet chamber; 4. Inlet pipe for heated liquid; 5. Heat exchange channel; 6. Outlet pipe for heated liquid; 7. Guide pipe; 8. Outlet pipe for unvaporized liquid; 9. Steam reflux device; 901. Reflux pipe; 902. Check valve; 10. Gas-liquid separation device; 11. Outlet pipe for liquefied liquid; 12. Sloping top plate; 13. Venturi hole; 14. Condensate collection tank; 15. Conduit; 16. Venturi tube structure. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] See Figures 1-3 A preferred embodiment of the present invention provides a flash heat exchange device, comprising: a high-pressure heating tank 1 and a heat exchange device 3.

[0030] The high-pressure heating tank 1 is used to heat and pressurize the flash liquid. The high-pressure heating tank 1 is connected to a flash liquid inlet pipe 2, which connects to an external flash liquid inlet source. The high-pressure heating tank 1 is equipped with a heating device to heat the flash liquid. The heating device can precisely control the temperature of the flash liquid, raising it but keeping it below the vaporization critical temperature under the pressure inside the high-pressure heating tank 1, ensuring that the liquid does not vaporize prematurely. The flash liquid is introduced into the high-pressure heating tank 1 through the flash liquid inlet pipe 2, replenishing the liquid consumed during the flash operation and maintaining the stable operation of the flash heat exchanger. The flash liquid inlet pipe 2 is equipped with a sealing valve, which effectively prevents gas leakage from the high-pressure heating tank 1 during liquid injection, thus ensuring that the pressure inside the tank remains high.

[0031] The heat exchange device 3 is provided with a heat exchange liquid exit chamber 301, a flash heat exchange chamber 302, and a heat exchange liquid inlet chamber 303, which are sequentially sleeved from the inside to the outside along the radial direction of the heat exchange device 3. The heat exchange liquid exit chamber 301 is sleeved on the outside of the high-pressure heating tank 1. The heat exchange liquid inlet chamber 303 is connected to a liquid to be heated inlet pipe 4 (it should be noted that, in the preferred embodiment, the liquid to be heated can be a flash liquid to be preheated). The heat exchange liquid inlet chamber 303 communicates with the heat exchange liquid exit chamber 301. A radially arranged heat exchange channel 5 is connected to the flash heat exchange chamber 302. The heat exchange liquid exiting the chamber 301 is connected to a heated liquid discharge pipe 6. The high-pressure heating tank 1 is connected to the flash heat exchange chamber 302 through a guide pipe 7, which is used to allow the high-temperature and high-pressure liquid from the high-pressure heating tank 1 to flow into the flash heat exchange chamber 302. The flash heat exchange chamber 302 is connected to an unvaporized liquid discharge pipe 8, which is used to discharge unvaporized solvent to the external environment.

[0032] The liquid to be heated enters through the liquid inlet pipe 4, flows sequentially through the liquid inlet chamber 303, the heat exchange channel 5, and the liquid outlet chamber 301, and exits through the heated liquid outlet pipe 6. The flash heat exchange chamber 302 is located between the liquid outlet chamber 301 and the liquid inlet chamber 303. During flash heat exchange, the vaporized flash liquid exchanges heat with the liquid to be heated through the side wall of the flash heat exchange chamber 302 and the heat exchange channel 5, increasing the heat exchange contact area. To minimize heat loss during flash heat exchange, insulation structures are installed at the top and bottom of the heat exchange device 3, effectively reducing heat loss to the external environment and improving the overall thermal efficiency of the heat exchange process. The guide pipe 7 guides the flash liquid into the flash heat exchange chamber 302. When the high-temperature, high-pressure liquid enters the flash heat exchange chamber 302, the pressure drops instantaneously. At this point, the liquid temperature is higher than the saturation temperature at that pressure, causing part of the flash liquid to vaporize instantaneously, completing the flash process. The unvaporized portion of the flash liquid solvent is discharged to the external environment or the next stage flash heat exchanger through the unvaporized liquid discharge pipe 8. Timely discharge of unvaporized liquid through the unvaporized liquid discharge pipe 8 helps to maintain a low pressure in the flash heat exchange chamber 302 and to ensure that the flash liquid vaporizes after entering the flash heat exchange chamber 302.

[0033] Working principle: The liquid to be flashed enters the high-pressure heating tank 1 through the liquid inlet pipe 2. The high-pressure heating tank 1 heats and pressurizes the liquid to be flashed, bringing its temperature close to but not reaching the vaporization temperature under that pressure. Once the flashing conditions are met, the liquid enters the flash heat exchange chamber 302 through the guide pipe 7. The pressure inside the flash heat exchange chamber 302 is lower than the pressure of the high-pressure heating tank 1, and the temperature of the liquid is higher than the saturation temperature under that pressure. Flashing occurs upon entering the flash heat exchange chamber 302, with some of the liquid instantly vaporizing and rising, exchanging heat through the side wall of the flash heat exchange chamber 302 and the heat exchange channel 5 penetrating it. The liquid to be heated enters through the liquid inlet pipe 4, flows sequentially through the liquid inlet chamber 303, the heat exchange channel 5, and the liquid outlet chamber 301, and then flows out through the heated liquid outlet pipe 6. The liquid to be heated exchanges heat with the steam generated by flash evaporation through the side wall adjacent to the flash heat exchange chamber 302 and the heat exchange channel 5, thereby achieving a temperature increase. The unvaporized portion of the flash liquid solvent in the flash heat exchange chamber 302 is discharged to the external environment through the unvaporized liquid discharge pipe 8 or transported to the next stage flash heat exchange device for processing.

[0034] Clearly, the high-pressure heating tank 1, heat exchange liquid exit chamber 301, flash heat exchange chamber 302, and heat exchange liquid inlet chamber 303 are sequentially connected from the inside out. The heat exchange liquid exit chamber 301 and heat exchange liquid inlet chamber 303 provide insulation, allowing lost heat to be transferred to the heat exchange liquid. The heated heat exchange liquid in the heat exchange liquid exit chamber 301 insulates the outer walls of the high-pressure heating tank 1 and the guide pipe 7, reducing heat loss to the external environment. The heat exchange liquid exit chamber 301 and heat exchange liquid inlet chamber 303, which exchange heat with the flash liquid, are respectively connected to the inner and outer sides of the flash heat exchange chamber 302, allowing the sidewalls of the flash heat exchange chamber 302 to also exchange heat with the liquid to be exchanged. This not only expands the heat exchange area but also improves the heat exchange efficiency. The sidewalls of the guide pipe 7, which guides the flash liquid, are not in direct contact with the external environment, further reducing heat loss during the flow process and ensuring effective heat transfer to the liquid to be exchanged, thereby improving heat exchange efficiency.

[0035] In this embodiment, preferably, a flash heat exchanger further includes a steam reflux device 9. The steam reflux device 9 includes a reflux pipe 901 and a one-way valve 902. One end of the reflux pipe 901 is connected to the top of the flash heat exchange chamber 302, and the other end is connected to the top of the high-pressure heating tank 1. The one-way valve 902 is located on the reflux pipe 901 and is used to allow the flashed steam to flow back to the high-pressure heating tank 1. When the flash liquid partially vaporizes in the flash heat exchange chamber 302, the generated steam exchanges heat with the liquid to be exchanged. The vaporized flash liquid that has completed the heat exchange is guided back to the high-pressure heating tank 1 through the steam reflux device 9. The reflux process not only effectively reduces heat loss and avoids heat waste caused by steam discharge, but also shortens the heating time of the high-pressure heating tank 1 and improves heat exchange efficiency. The one-way valve 902 only allows gas to flow from the flash heat exchange chamber 302 to the high-pressure heating tank 1, preventing gas from flowing back into the flash heat exchange chamber 302. To avoid a situation where the pressure in the high-pressure heating tank 1 and the flash heat exchange chamber 302 is the same due to the reflux device, the pressure in the flash heat exchange chamber 302 is always lower than the pressure in the high-pressure heating tank 1. This pressure difference is a necessary condition for the flash phenomenon to occur, which helps the flash process to proceed smoothly and thus improves the flash efficiency.

[0036] In this embodiment, preferably, a gas-liquid separation device 10 is provided in the flash heat exchange chamber 302. The gas-liquid separation device 10 allows steam to flow to the return pipe 901 and traps the condensed liquid. A liquefied liquid drain pipe 11 is connected to the bottom of the gas-liquid separation device 10, which is used to discharge the solvent condensed by the gas-liquid separation device 10 to the external environment. After the flash liquid enters the flash heat exchange chamber 302, the temperature instantly reaches the vaporization temperature at that pressure due to a sudden pressure drop. At this time, some of the flash liquid absorbs heat and vaporizes, while another part of the flash liquid fails to vaporize due to insufficient heat and remains at the bottom of the flash heat exchange chamber 302. These unvaporized liquids may differ in composition from the vaporized steam, therefore, the gas-liquid separation device 10 is needed to separate the two phases. The vaporized flash liquid exchanges heat with the liquid to be heated. Some of the vapor will re-liquefy due to the release of heat, forming condensate which is then discharged or further processed through the liquefaction drain pipe 11. The gas-liquid separation device 10 can separate the flash liquid into a gas phase and a liquid phase. The liquefied vaporized flash liquid is discharged through the liquefaction drain pipe 11, while the unvaporized flash liquid is discharged through the unvaporized liquid discharge pipe 8, thereby achieving the separation and collection of the gas and liquid phases.

[0037] The gas-liquid separation device 10 divides the interior of the flash heat exchange chamber 302 into an upper chamber and a lower chamber. The gas-liquid separation device 10 includes a sloping top plate 12 and a side plate connected to the sloping top plate 12. The side plate has multiple air passages 13, which connect the upper chamber and the lower chamber. The upper chamber mainly serves as the heat exchange area between the vaporized flash liquid and the liquid to be heated, while the bottom of the upper chamber is used to contain the liquefied flash liquid after vaporization. The lower chamber is the area where the flash liquid vaporizes, and its bottom is used to contain the unvaporized flash liquid. In the lower chamber, some of the flash liquid vaporizes due to pressure reduction, and the resulting steam can enter the upper chamber through the air passages 13. In the upper chamber, this steam exchanges heat with the liquid to be heated, and some of the steam liquefies due to the release of heat. The liquefied flash liquid flows into the bottom of the upper cavity along the inclined top plate 12 of the gas-liquid separator 10, and is finally discharged through the liquefied liquid drain pipe 11, thus achieving effective gas-liquid separation.

[0038] The gas-liquid separation device 10 is equipped with two condensate collection tanks 14, which are distributed radially from the inside to the outside of the high-pressure heating tank 1. The condensate collection tank 14 on the side closer to the high-pressure heating tank 1 and the condensate collection tank 14 on the side farther from the high-pressure heating tank 1 are connected by a conduit 15. The condensate collection tank 14 on the side farther from the high-pressure heating tank 1 is connected to the liquefied drain pipe 11. The condensate collection tank 14 is used to contain the liquefied steam during the heat exchange process. When the steam releases heat and liquefies during the heat exchange process, the resulting condensate flows into the condensate collection tank 14 along the inclined top plate 12. Since the two condensate collection tanks 14 are not connected, they need to be connected by a conduit 15 to ensure that the condensate in the two condensate collection tanks 14 can be discharged simultaneously by the liquefied drain pipe 11.

[0039] In this embodiment, preferably, the heated liquid discharge pipe 6 and the liquid to be flashed input pipe 2 are sequentially connected along the liquid flow direction. Introducing the heated heat exchange liquid into the high-pressure heating tank 1 through the heated liquid discharge pipe 6 and the liquid to be flashed input pipe 2 effectively reduces the heating time required for the high-pressure heating tank 1. Simultaneously, by preheating the liquid to be flashed, the flash heat exchange device can complete the flash heat exchange process with less time and heat consumption, improving energy utilization efficiency and operational economy.

[0040] In this embodiment, preferably, the steam reflux device 9 is further provided with a suction device, which is used to draw the gas in the flash heat exchange chamber 302 into the high-pressure heating tank 1. By drawing the gas from the flash heat exchange chamber 302 into the high-pressure heating tank 1, the suction device reduces the pressure within the flash heat exchange chamber 302, creating more favorable flash conditions for the liquid to be flashed, thereby improving flash efficiency. It also pressurizes the high-pressure heating tank 1, preventing premature vaporization of the liquid within it. After pressurization, the liquid in the high-pressure heating tank 1 can remain liquid at a higher temperature without vaporization. The pressure difference between the high-pressure heating tank 1 and the flash heat exchange chamber 302 also promotes the flow of liquid within the flash heat exchange device, ensuring smoother and more efficient operation of the entire device and improving the efficiency of flash heat exchange.

[0041] In this embodiment, preferably, one end of the guide tube 7 located within the flash heat exchange chamber 302 is a Venturi tube structure 16, used to depressurize the high-pressure liquid and release it into the low-pressure flash heat exchange chamber 302. The end of the guide tube 7 inserted into the flash heat exchange chamber 302 employs a Venturi tube structure 16. A Venturi tube is a pipe fitting with a specific geometry, its inlet section gradually narrowing to form a narrow throat, followed by a gradually expanding outlet section. This design causes the fluid velocity to increase significantly at the throat while the pressure decreases as the fluid passes through the Venturi tube. When the high-pressure liquid flows through the Venturi tube, its pressure is effectively reduced and smoothly released into the low-pressure flash heat exchange chamber 302. The Venturi tube structure 16 effectively reduces the liquid pressure, thereby promoting flash evaporation, and also reduces the impact and energy loss of the liquid entering the flash heat exchange chamber 302, improving liquid flow efficiency.

[0042] Multiple heat exchange channels 5 are provided, and these channels 5 are distributed at intervals along the direction of gravity; they are also distributed at intervals along the circumference of the flash heat exchange chamber 302. These multiple heat exchange channels are evenly distributed at intervals along the direction of gravity and the circumference of the flash heat exchange chamber 302. This increases the heat exchange area between the steam and the heat exchange liquid, allowing the steam to contact more heat exchange channels during its ascent, thereby improving heat transfer efficiency. Simultaneously, it increases the steam's ascent path, requiring a longer path to reach the reflux device, allowing for more time for heat exchange between the steam and the heat exchange channels, thus achieving more thorough heat exchange. The spaced distribution of multiple heat exchange channels improves heat exchange efficiency, making heat transfer more efficient and complete.

[0043] The sidewall between the high-pressure heating tank 1 and the heat exchange liquid exit chamber 301 is made of heat-insulating material. This material prevents heat loss into the heat exchange liquid exit chamber 301, ensuring that as much heat as possible within the high-pressure heating tank 1 is used to heat the liquid to be flashed, thus avoiding heat waste. It also prevents the heat exchange liquid in the heat exchange liquid exit chamber 301 from absorbing additional heat and causing a decrease in heat exchange efficiency.

[0044] In this embodiment, preferably, multiple sections are arranged circumferentially around the high-pressure heating tank 1, including the flash liquid inlet pipe 2, the guide pipe 7, the unvaporized liquid outlet pipe 8, the return pipe 901, the liquefied liquid outlet pipe 11, and the conduit 15. This maintains a uniform liquid level and temperature within the flash heat exchanger, preventing operational instability caused by localized abnormalities in liquid level or temperature, and improving working efficiency. The even distribution of multiple pipes ensures a more uniform and stable liquid flow process, thereby improving the overall efficiency of the device.

[0045] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flash heat exchanger apparatus, characterized by, include: High-pressure heating tank (1), the high-pressure heating tank (1) is used to heat and pressurize flash liquid; The high-pressure heating tank (1) is connected to a liquid input pipe (2) for flashing, which is used to connect to an external liquid input source. A heat exchange device (3) is provided with a heat exchange liquid exit chamber (301), a flash heat exchange chamber (302), and a heat exchange liquid inlet chamber (303) sequentially connected from the inside to the outside along the radial direction of the heat exchange device (3). The heat exchange liquid exit chamber (301) is sleeved on the outside of the high-pressure heating tank (1). The heat exchange liquid inlet chamber (303) is connected to a liquid inlet pipe (4) to be heated. The heat exchange liquid inlet chamber (303) and the heat exchange liquid exit chamber (301) are connected through a radially arranged heat exchange channel (5). The heat exchange channel (5) passes through the flash heat exchange chamber (302), and the heat exchange liquid exit chamber (301) is connected to the heated liquid discharge pipe (6); the high-pressure heating tank (1) is connected to the flash heat exchange chamber (302) through the guide pipe (7), and the guide pipe (7) is used to allow the high-temperature and high-pressure liquid of the high-pressure heating tank (1) to flow into the flash heat exchange chamber (302); the flash heat exchange chamber (302) is connected to the unvaporized liquid discharge pipe (8), and the unvaporized liquid discharge pipe (8) is used to discharge the unvaporized solvent to the external environment.

2. A flash heat exchanger according to claim 1, wherein The flash heat exchanger also includes a steam reflux device (9), which includes a reflux pipe (901) and a one-way valve (902). One end of the reflux pipe (901) is connected to the top of the flash heat exchange chamber (302), and the other end of the reflux pipe (901) is connected to the top of the high-pressure heating tank (1). The one-way valve (902) is located on the reflux pipe (901) and is used to allow the flashed steam to reflux back to the high-pressure heating tank (1).

3. A flash heat exchanger according to claim 2, wherein The flash heat exchange chamber (302) is equipped with a gas-liquid separation device (10), which can supply steam to the return pipe (901) and retain the condensed liquid; the bottom of the gas-liquid separation device (10) is connected to a liquefied drain pipe (11), which is used to discharge the solvent condensed by the gas-liquid separation device (10) to the external environment.

4. The flash heat exchanger according to claim 3, characterized in that, The gas-liquid separation device (10) divides the interior of the flash heat exchange chamber (302) into an upper chamber and a lower chamber. The gas-liquid separation device (10) includes a sloping top plate (12) and a side plate connected to the sloping top plate (12). The side plate has a plurality of air passage holes (13) that connect the upper chamber and the lower chamber.

5. A flash heat exchanger according to claim 4, wherein The gas-liquid separation device (10) is provided with two condensate collection tanks (14), which are distributed from the inside to the outside along the radial direction of the high-pressure heating tank (1). The condensate collection tank (14) on the side of the gas-liquid separation device (10) close to the high-pressure heating tank (1) and the condensate collection tank (14) on the side away from the high-pressure heating tank (1) are connected by a conduit (15). The condensate collection tank (14) on the side away from the high-pressure heating tank (1) is connected to the liquefied drain pipe (11).

6. A flash heat exchanger as claimed in claim 1, wherein The heated liquid discharge pipe (6) and the liquid input pipe (2) are connected sequentially along the liquid flow direction.

7. A flash heat exchanger according to claim 2, wherein The steam reflux device (9) is also provided with a suction device, which is used to draw the gas in the flash heat exchange chamber (302) into the high-pressure heating tank (1).

8. The flash heat exchanger of claim 1, wherein The guide tube (7) has a Venturi tube structure (16) at one end inside the flash heat exchange chamber (302), and is used to depressurize the high-pressure liquid and release it into the low-pressure flash heat exchange chamber (302).

9. A flash heat exchanger as claimed in claim 1, wherein The heat exchange channel (5) is provided with multiple channels, which are distributed at intervals along the direction of gravity; the multiple heat exchange channels (5) are distributed at intervals along the circumference of the flash heat exchange chamber (302).

10. The flash heat exchanger of claim 1, wherein The sidewall between the high-pressure heating tank (1) and the heat exchange liquid exit chamber (301) is a component made of heat-insulating material.

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